[remedia] add new media repository for remedia code.

This CL forks implementation of media repository. It also adds an abstract class that has common implementation. It adds an interface that should be consumed by MediaInteractor.

Flag: com.android.systemui.media_controls_in_compose
Bug: 397989775
Test: build.
Change-Id: I718aa1e63f1cfa51ad0d545d99cbce34af81ce64